Stay-bolt structure.



E. I. DODDS. STAY BOLT STRUCTURE. APPLICATION FILED MAY a. 1918.

Patented Mar. 4, 1919.

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ETHAN I. DODDS, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO FLANNERY BOLTCOMPANY, OF PITTSBURGH, PENNSYLVANIA.

STAY-BQLT STRUCTURE.

Specification of Letters Patent.

Patented Mar. 4, 1919.

Application filed May 3, 1918. Serial No. 232,317.

will enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to improvements in staybolt structures and moreparticularly to means for effecting rigid connection of the stayboltwith a boiler sheet or other member,the object of the invention being toprovide simple and efiicient means which will afford ready access to theend of the staybolt for testing purposes.

IVith this and other objects in view, the invention consists in certainnovel features of construction and combinations of parts as hereinafterset forth and pointed out in the claim. I

In the accompanying drawings, Figure 1 is a sectional view illustrating'my improvements, and Fig. 2 is a plan view.

1 represents a boiler sheet or member with which the staybolt is to beconnected. The boiler sheet 1 is provided with an opening having athreaded wall for the accommodation of a threaded sleeve 2, the latterbeing provided with a conical inner wall 3, and

said sleeve is provided with an annular extension 4 having inwardlyprojecting segmental shoulders 5 at its free edge.

The conical inner face 3 of the sleeve 2 constitutes a bearing which isengaged by the conical exterior face 6 of an annular head 7 which isscrewed on the end of a staybolt 8,it being understood that the otherend of said bolt is secured to another boiler sheet or member not shown.outer end portion of the annular head 7 is made interiorly with anangular configuration 9 to receive a wrench for a purpose hereinafterexplained. V

The end of the staybolt is normally cov- The ered by a cap or closure 10which may have an annular shoulder 11 to seat against the end of theannular head 7 of the staybolt. This cap or closure is provided withlateral lugs or shoulders 12 which, when said cap is turned, will becomedisposed behind the segmental shoulders 5 of the sleeve 2 and tofacilitate the turning of said cap it may be provided with an angularsocket 18 to receive a wrench.

By turning the cap 10 until the segmental lugs or shoulders 12 shallhave been moved out of line with segmental shoulders 5,'said cap may beat once removed to expose the end of the staybolt. The operator willthen insert a wrench into the angular portion 9 of the annular head 7and attempt to turn the latter. If he is unable to turn said head, thisfact will indicate at once that the bolt is Whole, but if he is able toturn it, he can I remove it together with a broken portion of a bolt.

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is:

The combination of a sleeve having its interior wall conical andstraight longitudinally of the sleeve, said sleeve having an allnularextension provided with inwardly projecting segmental shoulders, astaybolt, a head provided on said'bolt and having a conical interiorface conforming to the conical interior of said sleeve, said headadapted for the reception of a wrench, a removable cap enterin thesleeve extension over the end of the b0 t and engaging said head, andoutwardly projecting segmental lugs or shoulders on said cap adapted toengage behind the inwardly projecting segmental shoulders on said sleeveextension.

In testimony whereof, I have signed this specification inthe presence oftwo subscrib- S. G. NOTTINGHAM, R. S. FERGUSON.

Copies of this patent may be! obtained for five cents each, byaddressing the Commissioner of Patents, Washington, D. O.

